Phone appears to charge but immediately dies when unplugged OR does not respond when plugging the charger in.

Make sure the battery and charger are not damaged. Also check that the contacts in the case are clean. When the device is plugged into the charger, an indicator light should turn on. If it does not turn on, plug the charger into a different outlet. If the light still does not turn on, try using a different charger and/or battery (if available). If none of these work, there is a problem with the phone's hardware.

Check for physical damage. Remove the battery door and take out the battery. Check the indicator sticker on the battery. If it is red or pink, water damage may have occurred to your phone. If it is white, there is a problem with phone.